Turn on USB mode for samsung galaxy s2 android Jelly bean

------------- In Mobile ----------------
1. In mobile Go to setting -> More setting

2. Select USB utilities

3. Select Connect storage to PC

------------- other ---------------------
4. Connect mobile to PC via Cable
------------- In Mobile ----------------
5. In mobile will show USB mass storage

6. Select Turn on USB storage then Select OK

7. Wait for popup show in PC
------------ in PC ----------------------
8. In PC go to Start->Computer->

    Drive F: is mobile Memory
    Drive G: is SD card Memory